GND sounds good tbh, but we should get the future electricity price decrease in writing. Or some kind og guarantee 
# This is written in python 3
# Feel free to use this in your own projects
def truncate(f, n):
'''Truncates/pads a float f to n decimal places without rounding'''
s = '{}'.format(f)
if 'e' in s or 'E' in s:
return '{0:.{1}f}'.format(f, n)
i, p, d = s.partition('.')
return '.'.join([i, (d+'0'*n)[:n]])
###################
# HARCODED VALUES #
###################
#Cost in USD of miner (grand total)
minerCost = 1542.5
#Revenue of miner $/day
minerRevenue = 10.21
#Power cost of miner $/day
minerPowerCost = 1.67
#this block should be mined on November 27th
startBlock = 385389
#this is my projected difficulty on the 27th
startDiff = 66500000000
#this is the starting % increase every two weeks
expectedDiffIncrease = 4.0
#this is the % change in difficulty increase every two weeks
diffIncreaseDelta = -3.0
breakeven = False
revenue = 0
daysElapsed = 0 #in days
currentBlock = startBlock
currentDiff = startDiff
print("Simulation start: \nDifficulty is {}. \nProfit is ${} per day.\nExpected difficulty increase is {}%, with future increases changing by {}%.".format(truncate(currentDiff, 2), truncate(minerRevenue - minerPowerCost, 2), truncate(expectedDiffIncrease, 2), truncate(diffIncreaseDelta, 2)))
while True:
#1 loop = 1 block
if (currentBlock % 2016 == 0):
currentDiff *= (100 + expectedDiffIncrease)/100
minerRevenue *= (100 - expectedDiffIncrease)/100
print("Difficulty is now {} (+{}%). Profit is now ${} per day".format(truncate(currentDiff, 2), truncate(expectedDiffIncrease, 2), truncate(minerRevenue - minerPowerCost, 2)))
expectedDiffIncrease *= (100 + diffIncreaseDelta)/100
if (currentBlock == 420000):
minerRevenue /= 2
print("The block reward has halved. Profit is now ${} per day".format(truncate(minerRevenue - minerPowerCost, 2)))
if (minerRevenue - minerPowerCost <= 0):
print("Miner is no longer profitable. Ending simulation\n")
break
if (currentBlock - startBlock) % int((144*(100+expectedDiffIncrease)/100)//1) == 0: #calculates real time, note that this accounts for less time between blocks when diff spikes
daysElapsed += 1
if currentBlock == 450000:
print("End of simulation reached.\n")
break
if (revenue > minerCost and breakeven == False):
print("BREAK EVEN REACHED ON DAY {}!".format(daysElapsed))
breakeven = True #hell yes
revenue += minerRevenue/24/6 - minerPowerCost/24/6
currentBlock += 1
print("{} days have elapsed.".format(daysElapsed))
print("Your total revenue after hosting costs: {}".format(truncate(revenue,2)))
print("Your net gain/loss: ${}".format(truncate(revenue-minerCost,2)))
Simulation start:
Difficulty is 66500000000.00.
Profit is $8.54 per day.
Expected difficulty increase is 4.00%, with future increases changing by -3.00%.
Difficulty is now 69160000000.00 (+4.00%). Profit is now $8.13 per day
Difficulty is now 71843408000.00 (+3.88%). Profit is now $7.75 per day
Difficulty is now 74547306503.50 (+3.76%). Profit is now $7.39 per day
Difficulty is now 77268799058.20 (+3.65%). Profit is now $7.06 per day
Difficulty is now 80005019548.00 (+3.54%). Profit is now $6.75 per day
Difficulty is now 82753140848.50 (+3.43%). Profit is now $6.46 per day
Difficulty is now 85510382834.30 (+3.33%). Profit is now $6.19 per day
Difficulty is now 88274019729.60 (+3.23%). Profit is now $5.94 per day
Difficulty is now 91041386800.50 (+3.13%). Profit is now $5.70 per day
Difficulty is now 93809886395.30 (+3.04%). Profit is now $5.47 per day
Difficulty is now 96576993338.10 (+2.94%). Profit is now $5.26 per day
Difficulty is now 99340259691.70 (+2.86%). Profit is now $5.06 per day
Difficulty is now 102097318904.73 (+2.77%). Profit is now $4.88 per day
Difficulty is now 104845889362.98 (+2.69%). Profit is now $4.70 per day
Difficulty is now 107583777367.73 (+2.61%). Profit is now $4.53 per day
Difficulty is now 110308879565.73 (+2.53%). Profit is now $4.38 per day
Difficulty is now 113019184857.03 (+2.45%). Profit is now $4.23 per day
The block reward has halved. Profit is now $1.28 per day
Difficulty is now 115712775808.78 (+2.38%). Profit is now $1.21 per day
Difficulty is now 118387829603.62 (+2.31%). Profit is now $1.14 per day
Difficulty is now 121042618552.48 (+2.24%). Profit is now $1.08 per day
Difficulty is now 123675510201.35 (+2.17%). Profit is now $1.02 per day
Difficulty is now 126284967062.23 (+2.10%). Profit is now $0.96 per day
BREAK EVEN REACHED ON DAY 307!
Difficulty is now 128869545997.81 (+2.04%). Profit is now $0.91 per day
Difficulty is now 131427897289.49 (+1.98%). Profit is now $0.85 per day
Difficulty is now 133958763417.29 (+1.92%). Profit is now $0.81 per day
Difficulty is now 136460977579.81 (+1.86%). Profit is now $0.76 per day
Difficulty is now 138933461981.43 (+1.81%). Profit is now $0.72 per day
Difficulty is now 141375225912.73 (+1.75%). Profit is now $0.67 per day
Difficulty is now 143785363649.27 (+1.70%). Profit is now $0.63 per day
Difficulty is now 146163052192.63 (+1.65%). Profit is now $0.60 per day
Difficulty is now 148507548876.19 (+1.60%). Profit is now $0.56 per day
Difficulty is now 150818188857.25 (+1.55%). Profit is now $0.52 per day
End of simulation reached.
440 days have elapsed.
Your total revenue after hosting costs: 1641.04
Your net gain/loss: $98.54
